Michael's had these super-cute chargers with three different sizes. I liked picking three different colors to use. The larger two were $2, the smallest was $1.50.
I couldn't find anything at Michael's to tier them with, so I picked up some $2 bud vases and a pack of those pretty glass rocks to fill them with. I ran into a problem with that, however. 1) The glass vase broke when I put the glass rocks inside and shook it a little. 2) The tops of the vases weren't level, so it would have made the plates uneven, likewise.
Fortunately, Target came through for me. Found $2 taper holders.
I hot glued the taper holders to the top two tier plates. I decided not to glue all of them together so that I can use them separately or stacked, depending on what I need from them. The chargers said not to use for food, so I'll probably get some pretty doilies to put on them when I need to.