Weddingbee boards

I just got my cake topper in the mail from Crafty Eddy and I'm SO excited to decorate it.  But I need some advice on how to do so....

I've got a 4 inch tall 'M' and then a 3 inch tall 't' and a 3 inch tall 'b' that be on top of the cake.  Our colors are pink and black.  Any suggestions you guys have would be great.  I was thinking of rhinestones....but need to know good places to get them, and what sizes to use. 

We also have a 4 inch tall 'mr' and 4 inch tall 'mrs' that will be on the head table with us that needs decorating too!  Give me your input ladies!