It seems to me that with all the furniture items and styles out there, varying from free for all to free for subscribers to costing credits, there's quite a lot of combinations out there for your Glitch home.
I'd like to suggest a tool for previewing home design. It would have all furniture items available for placement, and filters to show free items, free for subscriber items, or paid items. It would total up the cost in credits, give you a link to get a subscription and/or buy credits right there, and/or perhaps even linking to the auctions to buy the furniture items with your currant balance.
It might also be possible to submit home designs through this tool to make "packages" for people who have no idea where to start. The community could vote on the best designs and give the winners something as a prize - perhaps some credits, a trophy or a notice on their home page for others to see.
This would be handy as an all in one tool and provide incentive for people to try out their ideas without breaking the bank. It should also encourage people to subscribe/buy credits - if there's a total right then and there, it seems more likely that a person will say "What the hell" and buy in rather than just getting a subscription one day randomly.