Hey everyone,
I was still stuck for a theme this week as I couldn't think of anything suitable, but some nice ones came up in our judge forum earlier in the week that I'd almost forgotten about.
So the one I'll be using this week, suggested by Burnt Joint, is colour. Basically how it goes is I specify a colour, and that colour must be prominent in your entries.
Red is your colour. Any tint or shade.

Generally any colour in the box above is acceptable, or just anything that looks red. Check with a judge if you're not sure.
Note that as stated, the colour red only has to be the prominent colour. You may include other minor colours, and use original colours of renders. I highly recommend you
do not make the whole sig the same colour. This means that a sig like I have here is acceptable:

So there you go, I hope that's understandable. Now go make me red signatures.
Good luck all and have fun - don't forget to read the rules and stuff, you know where they are.