redoing the question mark today. It looks too cartoony.
Found a good setting for animation length. 2 seconds to totally turn 360 degrees, and while doing so, bounce up and down smoothly 3 times. Just gotta write a tiny script to modify my jerky up and down from previous animations. Looks like the formula is position.z = sin 2Pi(t), if anybody is wondering.
I have 5 colors of secondary glow which can be applied to various qualities of item, or used for other reasons.
light green glow
brighter blue glow
brighter magenta glow
intense golden glow
and sparkling white glow
You can use these to represent your item qualities above common. I see most games are using similar colors now. One bonus green, two bonuses blue, three bonuses magenta or red, gold for 4, and white (or bright aqua) for 5
Edit:
Kingsroad uses white, green, blue, purple, gold, red, cyan, and yellow, where the colors represent common, fine, superior, epic, legendary, relic, artifact, and mythic
Drakensang uses white, green, blue, magenta, orange, and yellow, and possibly others I have not yet seen.
Sword Coast Legends uses white green, blue, pink-magenta, and yellow