They (cats) can sense when i'm tripping so they corral me because i give them a lot of attention.
Totally!!! My dogs and cats totally know when I'm tripping. I don't know how they do, but they do.... and they are sooo much fun to play with. One time on an assload of MDMA, I actually caught myself basically frenching my dog LOL... crazy times....
Kaliedascopes are really cool and can be cheaply made. I had a bunch of them ranging from small ones that are the size of a lip balm tin to a huge one about as big as a telescope. Just make sure you clean them often... in college they caused a huge outbreak of 'pink eye' and we didnt realize it until it was just the 'hippies' who were getting it and we were able to trace it back to my kaliedascope.
For blacklights, highlighters are cool, but simple powdered detergent looks AWESOME under black light. A friend of mine had a room we called "the black room". it was basically a bedroom, about 12 x 12. We painted the walls flat black, then used detergent and elmers glue to 'paint' the walls. We painted all kinds of crazy shit on there and once you flicked the black light, the place absolutely glowed... it was so cool!!!!
Other things that are cool are the "stereogram" books or the 'magic pictures'. I also like massage toys and Mardi Gras beads when tripping... and anything that has fire is always cool to watch.