In other words, giant penises just don't do it.
Lifesize effigies of princesskiti22's boobs, while tempting, don't quite do it either.
So. Basic rules: Clear (seeing other tips seems to help), plastic (mixed glass shards and bills don't spend well), and about the volume of the present jar (roughly 60oz, or 1.7l).
Since drawing attention to the jar appears to be necessary, I've been seriously thinking about including a light-up base such as this one. I actually would prefer something less "super-bright," but I'm interested in something that does a gradual color change, which a lot of the other bases I've seen don't - especially battery-powered bases, which are kind of a given.
The last thing I need to do is flash a light in the face of an epileptic.
I kind of like this jar, especially since it's actually designed for the purpose. The only problem is the black bottom, which defeats the "diffuse light through the jar" idea. Unless I can find an alternative ring-shaped light source. I've looked at LED necklaces (I don't need a whole lot of light), but again, all those I've found flash.
The top contender right at the moment is this guy (the 1.5l in the front of the picture). It might involve some money-fishing at the end of the night, but that's OK - I gots tools. If I use the base I mentioned earlier, I might have to stick something on the inside bottom to prevent direct light, but allow the body of the jar to act as a light pipe.
Right at the moment, I'm thinking of getting some clear labels, and simply putting either "Tips" or "Love Me!" on the front. Or both. Or something else. I'm still thinking about that. The hope is that with the light pipe effect, the black printing on the labels will stand out.
Though, offhand, when you run into a glowing container next to a DJ, you know what it's there for.
I know I'm overthinking this, but that's part of the fun - for me, at least.
There are other containers I've considered, by the way. There's this one, which at least looks nice in the pictures (though for my purposes, I could do without the spout), and this one, which I've mostly abandoned because it would be hard to nicely affix a label.