<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <ImageBrush x:Key="TerrainGrassBrush"  ImageSource="Resources/terrain_grass.jpg" x:Name="terrainbrush"></ImageBrush>
</ResourceDictionary>