I would just check before taking time, money, and effort to do that. Not a single school I'm looking at would factor those classes into your overall undergraduate GPA, and I wouldn't stray too far. I'm not saying only take things that fall into the required courses for OT programs, but taking some random, unrelated easy online course probably won't look good. I don't mean to sound obnoxious, but your own words - that you're looking for an easy online class to up your GPA - really should turn off any OT school. They're not going to hear you say those words, but they can tell certain things from your transcript. The other thing is that one class added to, say, 32 courses from undergrad, will make virtually no difference in your overall GPA, even if the class IS factored in.