This is THE deluxe accommodation for ladybirds and bumble bees. There are several different designs available and the time to install them isn't actually now it is late summer or early autumn ideally.
But if you are doing an early spring clean and you happen to disturb ladybirds, as I did during February, then there are several make shift solutions that will protect them through the remaining cold weather and this is what I did:
Des-res #1 - The upturned flowerpot with dried leaf and grass interior. This is anchored with a stick so it can't blow away.
Des-res #2 - Old perennial growth secured with twine. Ladybirds venture out of the middle when warm enough.
Des -res #3 - Plastic container (courtesy of Riverside Tandoori) with exit hole cut, dried leaf interior and covered for shade (bark in this instance).
Ladybirds feed on aphids and are an asset in your garden - take care of them and enjoy their presence. They are supposed to be lucky too apparently and I reckon that I re-homed about 20, so it looks like I could be in for a luck filled year :)