BennyNace made an excellent point about making sure your gliders can't get stuck. It's amazing the places that our sweet suggies can fit into, as you probably know. Just yesterday my little one crawled into a hole in one of her toys and was struggling to get out. Fortunately I was there to make sure she'd be ok, but we can't watch our suggies 24/7 so it's very important to take every precaution.
I'm not sure about about Walmart toys but I would probably be wary of them. I almost bought a cage from their website until I learned they weren't the safest (can't remember the reason though...maybe the paint). I prefer to go to reputable pet stores or make my own toys with items I know are safe. I've heard you can find some fun things at dollar stores.
I've never tried clip on food dishes or plastic houses. But as long as they're securely attached I guess they would work well.
I have a parrot that loves her rope perch so I thought about getting a smaller one for my glider. However, I read that rope can catch little glider nails. So I ended up getting fleece vines instead which she really enjoys swinging from. The cage I ended up buying from Exotic Nutrition came with several wood bird perches that I didn't think my glider would like too much. But I decided to try them anyway and she ended up loving them. Wood tends to absorb odors though so they have to be cleaned well.
The following is a pretty comprehensive list of safe/unsafe wood and branches. I've only used Eucalyptus but there are many others. Natural/untreated are best.
www.glidercentral.net/ubbthreads/ubbthreads.php/topics/807750/Safe_Woods_and_Plant_Toxicity