i think that since we have a lot of wings that add walking speed already that they should be +5%-10%walking speed and add like +10 to a different stat for each color
like for example: Blue +10 walking speed (for 5%) and +10 INT
Red +10% walking speed (or 5%) and +10 STR
and maybe have combination wings? those could cost extra if these become donation wings
example: Black Wings +10% walking speed (or 5%) and +7 (or an even 10 or 5 or something) INT and VIT
or have a different combination
OR could even add being able to do certain skills?
example: Green Wings: +10% (or 5%) walking speed and able to do Level 10 Jupitel Thunder (or any other skil that could be useful (: )
but its more for variety in things because to me i find adding alot of walking speed is pretty boring and thats what speed pots and BOTS and stuff are for correct? but thats my own opinion i guess (: