TP Rolls for Leprechaun or Fairy Houses?

Toilet paper rolls sometimes are used for crafts, and sometimes sit in the cupboard. Before recycling them, brush off the dust, check for spiders, and put them in a special kids' box. Sometimes those kids' imaginations just need a little something new to create with.

Perhaps those toilet paper rolls will become Leprechaun or Fairy houses. Perhaps they'll be rolling tunnels for matchbox cars.

I was thinking of using them like Lincoln Logs and cutting notches at one end of each roll, so they could fit together. The kids may be in the mood for that, or they might think of something better!;)