It is custom to provide groomsmen gifts, usher gifts and bridesmaid gifts for all attendants. You can ge the ushers a smaller gift but all should be given a very nice token of your appreciation for all that they do for you. Some great groomsmen gift ideas might include an engraved beer mug (very popular) or a set of personalized cufflinks (great accessory for the tux you are probably going to ask them to wear) or even a custom shot glass.

If you are a little older and all your groomsmen work in business jobs, getting them an engraved pen would be nice. The important thing is that no matter what their interest is, you can find a unique gift for him if you put a little effort into it. Try shopping online for great savings and convenience.