Is Elements the one with the Air, Fire, Water, Earth, etc. and you have to combine smaller shapes to make larger ones? If so, I tried that. It didn't really grab me right away, but if it should pop up in the Daily or Weekly Deal, I'll give it another try. My next planned purchase is Vault Cracker. I really got into that one, and when my time was up I felt rather upset. I guess that's a sign I should get the game...
Forgot to mention the Runes of Avalon games - if you're at all into Arthurian legend, these are quite good. There are some nice scenes that make good wallpapers, I find the music pleasant and relaxing, and the puzzles are quite challenging.
I never did play Myst or Riven.