There are some products that everyone needs to know about -- whether you live on a boat or not. One is 3M's Dual Lock. I love, love, love Dual Lock. This is a "reclosable fastener system". Think Velcro with only one side or that is un-mated. Dual Lock is a plastic tape with locking pins that locks to itself. The 250 version is strong, strong strong. While I love regular Velcro I have found that it does weaken over time and Stew will not use it for items that we want to stay put at sea.
We had a lot of art, photos, and "decorative items" on the walls of our former home. Here, Stew doesn't want to put a lot of screws into the boat's bulkheads -- it isn't as easy to fill a hole in the teak as it is to fill a dry wall hole. After we moved aboard he brought home 3M Dual Lock 250 and quickly discovered he had created a Dual Lock monster.
So far, it is has been used to hang 3 photos, three pieces of art, and one needlepoint work that my sister gave me. It holds up our galley knife storage thingamajig, and the hand soap in each head stays put at sea because the teak holders are stuck on with 3M Dual Lock. I am making a new drawer divider system for our flatware and 3M Dual Lock will hold those in place in the drawers. More recently, we were gifted with a delightful wall plaque and found a second wall ornament in the storage locker. Up they went with Dual Lock.
One drawback is that If you decide that your item must be removed, Dual Lock will remove the varnish. That hasn't bothered us as anyplace we have hung an item, we have removed one to hang another.
This is my home. For the first few years, we only had one piece of art decorating the main saloon. I would visit other boats or view photos in magazines and see how most live-aboards have decorated their spaces and I wanted that homey feeling. We hung that one true work of art, a print of the Penobscot Islands, in a special frame with acrylic glass and attached it to the bulkhead with special tools provided by the framing store. That is a wonderful system for large items. For everything else, there's Dual Lock.