Lists

Make a list of ... (anything) ...

An object for each colour of the rainbow
games our family played
things to take on a walk
holiday destinations
clothes you once had
items in your room
furniture in your grandparents' house
annoying sayings;

The act of listing alone is good, and sharing is even better, but it could be that from that you derive a stimulus for further writing. Olivia McCannon's 'Inventory' - a list poem about her grandparents' house - starts like this: 

Open door, high cistern, wooden loo-seat,
Harvesters hanging, mangle in passage-way
Long key in lock, block of wood dangling,
Wall-clock, drop-leaf table, pressure-cooker, beans,
Cherry-patterned table-cloth, jug of Bisto, crumbs,
Pink-yellow Battenburg, splashes of dark tea ...