I like the color of aquamarine, would it be possible to have it in block form for decoration?

Also add chisel support for multiple textures for these blocks! Not sure who owns that, you or the chisel developers, but these would make for fantastic design opportunities. Also a great place to use those not-good-enough-for-the-main-texture texture ideas.

Unlimited Chisel Works might be best suited for such a thing IMO, Machadeon (addon by Asie that adds support for various mods into chisel.)

I add to the list the reasonating gem block, crystal block, celestial crystal block, starmetal block.

aquamarine: maybe yea.
resonating gem: NO
any crystal: HELL NO - have you actually played with the mod?!
starmetal block: likely as it's already planned for another feature.

Yes I did, a really nice mod. I just give suggestions, you're free to do whatever you want, no need to be so agressive.