They work great for milk & cookies!
I've used them for LOTS of parties and get-togethers, they are perfect to hold on your lap. I used them for my sister's baby shower last year.
Below I used the plates only (under the fan) for the goodies at my daughter's birthday tea party!
And we used them for Christmas Day brunch for my side of the family, using the punch/tea cups as fruit cups!
They even have their own cabinet in the kitchen! :)