I'd stick to Craft ~ other inks would probably feather pretty badly, cause they just soak in?
Don't think I'm a stalker, but if you're looking for ideas, and want to see what others have done. . . .
JulieHRR has a wonderful frame idea in the DD gallery! She embossed, then painted, I think? If you're a fan club member, you can check it out here:
Gallery at Splitcoaststampers
She did another that's uploaded in the demo-only gallery:
Gallery at Splitcoaststampers
If you're not a member of the demo forum, here's a case by stampin3:
Gallery at Splitcoaststampers
I used Making Memories (acrylic) paints plus a zig painty:
Gallery at Splitcoaststampers
Lisa Lisa did some gorgeous frames from Ikea ~ check out her gallery here:
cathyscroggy's Gallery at Splitcoaststampers