diff --git a/src/Twig/Functions/IconExtension.php b/src/Twig/Functions/IconExtension.php
index 7dc26a1..c1e0c76 100644
--- a/src/Twig/Functions/IconExtension.php
+++ b/src/Twig/Functions/IconExtension.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Pcm\IconBundle\Twig\Functions;
 
+use Exception;
 use InvalidArgumentException;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFunction;
@@ -18,7 +19,7 @@ final class IconExtension extends AbstractExtension
         'size' => self::DEFAULT_SIZE
     ];
 
-    public function __construct(private array $directories)
+    public function __construct(private array $directories, private array $palletes)
     {
         if (empty($this->directories))
             throw new InvalidArgumentException('Directories array must contain at least one path!');
@@ -28,6 +29,21 @@ final class IconExtension extends AbstractExtension
 
         if ($dirsContainNonString)
             throw new \TypeError('Directories array must only contain strings!');
+
+        if (empty($this->palletes))
+            throw new InvalidArgumentException('Palletes array must contain at least one pallet!');
+
+        $pelletesContainNonarray = array_reduce($this->palletes,
+            fn($notArray, $path) => $notArray || !is_array($path));
+
+        if ($pelletesContainNonarray)
+            throw new \TypeError('Palletes array must only contain arrays!');
+
+        foreach ($this->palletes as $pallete) {
+            if (!(array_key_exists('stroke', $pallete) && array_key_exists('fill', $pallete))) {
+                throw new \Exception('Palletes must contain a "stroke" and "fill" key!');
+            }
+        }
     }
 
     /**
diff --git a/tests/Twig/Functions/IconExtensionTest.php b/tests/Twig/Functions/IconExtensionTest.php
index b444a29..dbb1d8b 100644
--- a/tests/Twig/Functions/IconExtensionTest.php
+++ b/tests/Twig/Functions/IconExtensionTest.php
@@ -10,11 +10,24 @@ use Pcm\IconBundle\Tests\TestKernel;
 use Pcm\IconBundle\Twig\Functions\IconExtension;
 use Pcm\IconBundle\Twig\Functions\IconNotFound;
 use PHPUnit\Framework\TestCase;
+use TypeError;
 
 class IconExtensionTest extends TestCase
 {
     private const ICON = 'test';
 
+    private const PALLETES = [
+        'primary' => [
+            'stroke' => 'stroke-primary',
+            'fill' => 'fill-primary'
+        ],
+
+        'white' => [
+            'stroke' => 'stroke-white',
+            'fill' => 'fill-white'
+        ],
+    ];
+
     /**
      * @var IconExtension
      */
@@ -22,7 +35,7 @@ class IconExtensionTest extends TestCase
 
     protected function setUp(): void
     {
-        $this->icon = new IconExtension(['tests/icons']);
+        $this->icon = new IconExtension(['tests/icons'], self::PALLETES);
     }
 
     public function testInstanceOf(): void
@@ -33,20 +46,19 @@ class IconExtensionTest extends TestCase
     public function testThrowsIfDirectoriesIsEmpty(): void
     {
         $this->expectException(\InvalidArgumentException::class);
-        new IconExtension([]);
+        new IconExtension([], self::PALLETES);
     }
 
     public function testThrowsIfDirectoriesContainsNonString(): void
     {
         $this->expectException(\TypeError::class);
-        new IconExtension([99]);
+        new IconExtension([99], self::PALLETES);
     }
 
-
     public function testThrowsIfDirectoriesContainsNonStringAmongStrings(): void
     {
         $this->expectException(\TypeError::class);
-        new IconExtension(['string', 99, 'string']);
+        new IconExtension(['string', 99, 'string'], self::PALLETES);
     }
 
     public function testThrowsWhenPassedAnInvalidIconName(): void
@@ -152,4 +164,34 @@ class IconExtensionTest extends TestCase
         $timesMatched = preg_match_all($heightRegex, $content);
         $this->assertSame(1, $timesMatched);
     }
+
+    public function testThrowsIfPalletsIsEmpty(): void
+    {
+        $this->expectException(\InvalidArgumentException::class);
+        new IconExtension(['/'], []);
+    }
+
+    public function testThrowsIfPalletesContainsNonArray(): void
+    {
+        $this->expectException(\TypeError::class);
+        new IconExtension(['/'], [99]);
+    }
+
+    public function testThrowsIfPalletesContainsNonArrayInbetweenArrays(): void
+    {
+        $this->expectException(\TypeError::class);
+        new IconExtension(['/'], [[], 99, []]);
+    }
+
+    public function testThrowsIfChildArrayDoesntContainStrokeKey(): void
+    {
+        $this->expectException(\Exception::class);
+        new IconExtension(['/'], [['fill' => '']]);
+    }
+
+    public function testThrowsIfChildArrayDoesntContainFillKey(): void
+    {
+        $this->expectException(\Exception::class);
+        new IconExtension(['/'], [['stroke' => '']]);
+    }
 }