Can you list your tank size and the exact specs of your light?
Some colorful softies that come to mind immediately are zoanthids, clove polyps, yellow polyps, paly's, and mushrooms. You may just have to look around to find some with the colors you want, but it is possible to find very colorful specimens. The most colorful ones can be a bit pricey, but you can always just buy frags and play the waiting game until they grow out.