I've 3 styles with 3 color and I would change color 3 times
fw_pm.png, new_pm.png, old_pm.png, re_pm.png, send.png
and I would use every color with every stlye
fw_pm.png, new_pm.png, old_pm.png, re_pm.png, send.png
and I would use every color with every stlye