My mother the master gardener and long standing member of the Hardy Plant Society made me a beautiful Living Wreath several years as a holiday gift. Its very easy to do and I have gotten great pleasure out of watching it grow.
Use sedums for your plantings as they don't take much care. I have my live wreath resting on a table nest to an outdoor chair. I placed a blue glass fishing float inside.
All items can be found at your local nursery. Line a wire wreath form with moss.
Then fill with potting soil and tuck in your sedums and more moss.