It really comes down to what you want. All the bouts could match or they could be different. Same goes for the bouquets.
For our wedding (I actually had to look at my pictures because I couldn't remember) H had a white rose with purple and green accents while the guys had purple roses with green accents.
Re: boutonnieres
For our wedding (I actually had to look at my pictures because I couldn't remember) H had a white rose with purple and green accents while the guys had purple roses with green accents.