DST, since they are not marked you can pretty much do anything. Cash game might be lame but since it's for fun and your talking $5 you can make it micro demons give each player the following for $5:
.10/.25 blinds for the night
.10 Blue x 10
.25 White x 8
.50 Yellow x 2
$1 Black x 1
Which gives them 21 chips to make it seem like they are holding big stacks and rebuy when they bust out.
Or, with 10 people and everyone just bringing $5, I would do a SNG style or small T500. Have everyone put in their $5 and make the break down on denoms something like:
$1 Blue x 25
$5 White x 25
$25 Yellow x 10
$100 Black x 1
Use a blind structure 20 minutes each level like below and winner takes all:
$3 $6, $5 $10, $10 $20, $20 $40, $25 $50, -Color up $1 & $5 - $50 $100, $75 $150, $100 $200, $125 $250, $150 $300, $200 $400, $300 $600, $400 $800, $500 $1,000
I quickly throguh this structure together. But you get my point. Play and winner takes all.
There's another thread here that talks about structures and you may gain something from it.
http://chiptalk.net/forum/showthread.php?t=12100
Ring game = cash game
BTW I love this site too.
Good Luck