Originally, these stages were in Ristar87´s Dragon Ball Z M.U.G.E.N Edition 2011 compilation, which is first mugen game I ever played and I started to customizing it.
Saikoro, thank you for your opinion, you have right it have smudgy look. I think some stages look better with it, some worse... In my opinion the good ones are Cliff of Desolation, Janemba's Stage, New Tuffle Planet, Piccolo Waterfall and Training Field
Here is comparison of before and now:
Spoiler, click to toggle visibilty
Edit2: I'm blind, nevermind