I placed 4 white 3M reflective squares (about an inch square) evenly spaced on my front and back rims. Clearly visible at night from a wide angle (not just from the side) and the fact that these are seen spinning catches attention. They are also less dorky than the plastic reflectors attached on spokes.

At the back I cut up and attached an orange ankle reflector on the fender and one of my rear lights is a Radbot 1000 with a built in reflector. I also sewed in a bright green triangle on my back-pack and wear bright orange ankle reflectors all the time.