Design your own Spacemarine:
Note: 368640 combinations are possible not counting color variants.
Note 2: Some forums like warhammer.org.uk don't allow animated GIFs as avatars. Use the "animated" checkbox in this case.
Note 3: The result of the download will look slightly different than the preview.
Note 4: Color names are Citadel Colors (and Vallejo Game Color names)