Updating decor on the cheap can be as easy as creating an instant collection and setting it out in a fetching bowl. These green glass marbles sell at Hudson in the South End for $5 each (the bowl is $25 at Grand in Somerville). There are endless options for creating your own instant still life - from vintage candlepin bowling balls (easily found at flea markets and on eBay) to buttons. www.hudsonboston.com. 312 Shawmut Ave., Boston, 617-292-0900.