.___. are you able to do that..?

No, you are not.

[Edit]Well, if you wish to change the image of one when attached to your pet you can give the minion an overlay. (:

:) Thank you, and another question. Can you buy minions that are already like.. example: a Galactic minion?

Umm, well you can't buy a minion in a certain color usually if it doesn't look like it, but there are minions that look Galactic to begin with such as the Nibu and Constellation.

Except maybe like the Black Octoplus and Orange Octoplus, etc.