The concept of shared husband and wife "wedding showers" is a more modern idea in which gifts for the couple are given, often in his and her varieties. This way the husband doesn't feel left out. The concept of a groom shower is a very new idea, as it is basically replacing the old bachelor party idea with a more manly gift giving event.
The lists below can also be used for buying gifts for couples, or buying generic his/hers gifts for people that maybe you don't know that well. (If you know the person better and know for example that she is into power tools / etc, maybe use the groom list instead.)
Category 1, Traditional Gifts for a Bridal Shower
- Linen napkins and napkin rings
- Dessert plates and bake-ware
- Tea set with teapot, possibly personalized
- Picture frame
- Crystal vase
- Champagne glasses
- Cashmere blankets
- Mixer
- Coffee maker
- Pie plate
- Dish towels and China
- Bedding
- Barware
- Platters
- Cookware set
- Knife set
- Lingerie
- Certificate for a spa day
- Coffee-table book of her favorite vacation spot
- Bathing suit for the honeymoon (get her size from the groom)
- Monthly wine or flower club membership
- Getting-ready robe embroidered with new last name (i.e., Mrs. Harris)
- Tent for two
- Breakfast-in-bed tray and pajamas
- Relaxation materials: scented candles and magazine subscriptions
- Travel gear
- Theater tickets
- Museum memberships
- Luggage and honeymoon guidebooks
- Beach towels and a beach bag
- Cool clock
- Gardening set in a cute bag
- Travel shoe bag
- Dual Activity Gifts (eg. if you know they both enjoy cycling, gifts that pertain to cycling would be a good gift, provided you know that they don't already own the items in question)
- His and Hers carry on luggage
- Wine Decanter or Wine Rack or Wine Trough
- His and Hers Watches (possibly with built-in GPS so they can track where their spouse is).
- Sexy Truth or Dare Game (or other games for couples).
- Fancy Salt and Pepper Shakers
- His and Hers Coffee Mugs
- Personalized His and Hers Coffee Mugs (photos of the couple or their names together on the mugs)
- Double Sized Travel Hammock, so they can both be lazy.
- Picnic Backpack or Picnic Hamper
- Gift Cards that are handy for the Honeymoon
- Books titled "Two in the Kitchen, a cookbook for newlyweds" and similar titles
- Cedar chest or "Hope Chest" - perfect for storing linens in. The cedar protects fabric from moths.
- 1200 Thread Count Comforter, King Size
- Airline Gift Card - basically the equivalent of a "Trip for Two to Somewhere")
- His and Hers Bath Towels, Large Towels are Best
- Archery Lessons for Two
- Large two seater porch swing (preferably with cupholders)
- Book titled "The Seven Principles of Making Marriage Work" and similar titles.
- His and Hers Pillow Cases, with their names embroidered on the pillow cases
- Kama Sutra Guide Book (avoid giving this book in front of too many conservative prying eyes)
- Personalized Cutting Board
Category 4, Modern Gifts for a Groom Shower
- Fishing Equipment - to be fair, make sure he actually likes fishing first
- Hunting Gear - for those who like both fishing and hunting, a fishing/hunting gift basket would work nicely.
- Sporting Equipment - golf equipment, archery equipment, gift card for running shoes, etc
- Power Tools
- Hand Tools / Sets of Tools
- Tool boxes, larger the better
- How To Guides to "Plumbing" and other household duties
- Books titled "How to keep the Wife Happy" and similar titles.
- Electronic gadgets - Bluetooth speakers, mood lighting,
- Waffle maker with all the trimmings. eg. a Bubble Waffle Maker
- Baseball Bat Electric Wine Opener, bottle openers of various sports affiliations (make sure the groom likes the team or sport in question)
- Personalized Pocket Knife or Swiss Army Knife
- Personalized Tools
- Personalized Bottle Opener
- BBQ
- BBQ set of tools
- Craft Beer Glasses
- Beer Crafting Kit
- Wooden Beer Carrier