When a pen (ball point/biro) runs out of ink, I keep it and turn it into a paper scorer. I find these easy to use and I can keep several on hand in lots of different places around "The Craftroom". To identify a pen as a scorer, I simply wrap some masking tape around the middle of it.
Unwanted Double-Sided Tape
If you want to get rid of double-sided sticky tape which has come through your work, just dust the excess with a little talcum powder. Use a make up brush to apply the powder to the point that it is no longer tacky.