@Bart: Flee as a Bird isn't Faure, it's a traditional funeral song (likely brought over from Spain).
Faure's Sicilienne would be amazing overworld music for an RPG: https://www.youtube.com/watch?v=U5Y0uQLgriA (this recording obviously not PD)
Pavane, also by Faure, probably has some potential for use as a town theme with some cutting https://www.youtube.com/watch?v=sWW7pfXlYLY (non-PD recording, I'll say it on all of them).
Flee as a Bird has potential too (some people's also non-PD rendition: https://www.youtube.com/watch?v=hCjDnkHuHoY)
(For the record, Bloodstone is a real thing; it's actually opaque, and green with bright red specks.)
There's no particular reason that the LPC base doesn't have a shadow.
Attribution everywhere the art appears would mean something more along the lines of, say, in every game or work it appears in, not that every time a graphic appears on the screen you need to roll the credits. Just do what other games do: have a credits section on the main menu or somesuch and include the information there. I think that that will satisfy most everyone. A separate credits file distributed with the game (ala a readme) might technically fulfill the requirement (I don't know if it does, I would suspect so though), but it may be hard to keep it together on all platforms and, frankly, it's not as satisfying for (and indeed, respectful of) the artists as doing it formally in the game.
Ruby, Sapphire (which come in every color but red, or they'd be a ruby), spinel (every color), tourmaline (every color and combination of colors) zircon (red, blue, orange, brown, colorless, etc) Titanite/Sphene (green, yellow, brown), Emerald, Aquamarine, Heliodor (yellow/yellow-green), Morganite (pink), Topaz (orange, red, pink, purple, apricot, blue, colorless), Garnet (red is most typical, almost any color is possible, with a number of sub-variety names), Diopside (green), Hiddenite (green), Kunzite (pink/pink-purple), Jade, cymophane/cat's eye (chrysoberyl), alexandrite, moonstone, sunstone (irridescent from metallic inclusions), spectrolite (internal rainbows), opal, etc. That's probably enough to start with.
Who cares if you can or can't release the source code if the final product can still be freely distributed? There is little commercial point in being closed-source if the end product is still not effectively monetizable. (edit: and by "effectively monetizable" I mean effectively monetizable in traditional closed-source fashion, of course. Even if your source is closed, if people are legally allowed to share the final product you're going to have some troubles).
this is why i have stuck to cc by
The first question that needs to be asked for a request like this is, have you already looked through the gallery to see if there is already something that matches what you need? If the answer is no, then you should do that first. There's not much point in having a gallery like OGA if every project needs everything made from scratch. If the answer is yes, you have looked, but no, there is nothing suitable, that's fine, but it would be very helpful for you to say why what's already available isn't workable. It will give a lot more direction in making a new set if someone does choose to do so.
Aside from that, you're missing just about every other key detail that's needed here. What resolution? What medium? What genre? What is the scope of this project? If it's just a fun experiment or a learning project, then you really don't need someone to pour hours of their time into a custom character. The FOSS status of your project would be handy as well. We won't stigmatize you if your project isn't open source, but some people here are likely to be more interested in contributing to a project which is going to be.
Wow, this one heck of a set of edits! I'm happy and flattered that you chose some of my pieces to put so much into.