Which signature blocks AREN'T in use?

I need to make a teleport place in my city-type thing, but despite the fact that I've tried loads of different blocks, they all seem to be in use...

I suppose my question should really be: Which signature blocks are being used?

/offtopic/ OMG UR PIC /offtopic/
All I know is that I have dipensers, furnaces and planks.

You can combine different blocks in different combinations you know. No need for them to be of all the same type.

You can? Oh well that makes things much easier then! Thanks ^_^

Just be careful to make sure you get the NSEW arrangement exact. Use the compass rune to confirm.

Try and make it slightly unique/hard to guess though as people can guess yours and end up in your house, and it's perfectly legal to do that.

I just make walls around my runes, prevents the wandering tele rune pvper.