Wow, you got a lot of very good ideas and I was thinking too that maybe the top tier could be a 3D ladybug, but whatever you do please post pictures I think it's going to be an adorable cake.
Ok ...now ladies I know this probably doesn't look real good but I made this bow to be one of the toppers for this cake....take in account there will be a couple of lady bugs ON the bow itself AND will be some flying out of the cake (eww that sounds gross LOL).... Also a couple of daisies in the front of it.
Now this is handpainted and not the best job but does it look ok?
If not I'll start over
I think your bow is very cute!
You could also make the cake the flower shape on top of the table.... then put a lady bug on top of that made out of cake or fondant.... then put a bow next to the lady bug's "antena"
I know just another idea to think about ... this site does that to you!