Disco Balls and Perfect Pink

First of all, I am ALL for combining disco with fitness. I can't promise anything, but down the track...a studio with disco balls and a great sound system for Ballet Sculpt is on my bucket list!
Maybe we could make do with some silver balloons in the meantime? Any ideas most welcome. I'll run it by the Powers That Be at Kew Recreation Centre!

On another note, I am testing the limits of etiquette when it comes to manicures. Is it ever okay to take your OWN nailpolish? I have found the perfect Ballet Sculpt approved pink (Essie Fiji) and I'm just not prepared to compromise! Wrong? Right? Help!