Prizes for using the debit card
As a suggestion, I would propose giving away 5 monthly awards of 1g each and 50 prizes of 0.5g each among users who use the debit card for purchases to foster growth in its use and incentivize users into realizing its ease of use.
The mechanics would be as simple as organizing a "raffle" among debit card users in wich each transaction would recognize one participation in the raffle. As every transaction is electronically traceable, it would be very easy to know how many "participations" are eligible and randomly pick the 55 winning transactions.
Every month, 55 prizes (5 prizes of 1g and of 50 prizes of 0.5g each) would be given away.
It is a simple and cheap way (barely USD 15,000 annual cost at current gold prices) of broadening the use of the debit card. Also, the cost would probably be lower as people using the debit card would probably later reaload its bitgold (or GoldMoney Personal) account.
Of course, this idea may be adjusted to 100 prizes of 0.5g each, 10 prizes of 1g, 10 prizes of 1g and 40 prizes of 0.5g, etc. But I suggest giving away as many prizes as possible, as prizes are better appreciated by participants when they have an understandably good chance of winning