If you're into blank keycaps, you can get 3~5 Gateron/EnjoyPBT blank keysets for the price of a decent labelled keyset to create mixed tone keysets with. So far I've gotten 4 (Black, Dark gray, Milk White, and Ghost White). I plan to get Tan and CMYK to finish the blank collection.
Best parts are:
1. Quality is top notch
2. You can create new keysets when you get tired one
That said, it's all Cherry profile so I ordered a SA Solarized Penumbra for times when I miss the sound of raindrops.