I've been meaning to post on this topic for some time. I started building an insect hotel a year ago but didn't get very far. (It turns out you need quite a lot of material).
Then (as I may have mentioned before) we went for a week's break in Lyon. In their parks they are going in for insect hotels in a big way. This installation was on a vacant patch on a street corner in the Croix Rousse area :
Alongside there is a traditional herb spiral, re-dubbed an "insect spiral"!
All these installations looked pretty new, so it would be interesting to revisit them to see how they progress.
Meanwhile back to my own paltry efforts:
You can see some better pictures of the Parc Tete d'Or site at the following link: