Spillers are plants that literally spill over the edge of the pot and balance out the thriller.
Far Out Tips
Look for a container with a good drain hole
Pick annual color potting mix (usually this has fertilizer already in it)
If your potting mix is feed free, grab a small bag of annual color fertilizer and incorporate according to package instructions. Usually 1 Tbsp is all you need per season.
Beauty & balance in odd numbers – pick an odd number of plants!