>> It always looks lovely when plants spill over the side of a container. <<

Yeah, it's a favorite. Later in the season, some of the violas and pansies do that. I like vining petunias for it, especially the Wave kind, and the miniature million bells.

>> I have the columbines popping up all over, mostly just plain purple though.<<

They come in so many colors!

>> I do hope to get some pinks for the garden this year.<<

Go for it. They're often sold in packs of 4-8 in assorted colors, which is way cheaper than buying bigger individual pots.