BMP Buddy lets you batch recolour hair pieces or Tinker templates by replacing up to 4 placeholder colours with a tiling BMP pattern or a Babyz palette colour. Load one or more prepared templates (see below) under "Templates", then set at least one template colour to either a texture or a flat colour (great for outlines!).
Templates must be no bigger than 256 by 256 pixels and be 256-colour .BMP files or .PNG files with no colour profile. The areas you want to replace must use the exact colors #ff0000, #00ff00, #ffff00, and #0000ff. The tool will ignore all other colours.