Just make meringue blobs (I find nests too tricky!). They freeze really well and defrost quickly, and you can use them later either just with some fruit and yohgurt for instant DCs pudding, or to make eton mess.
make lots of meringues - they keep brilliantly so you can put off thinking about what to do with them till you are more inspired.
or freeze them - egg whites freeze fine.
lemon meringue won;t help as you need the yolks to make the filling, otherwise I'd have suggtsed making a lemon meringue with cheesecake type base (you know, crushed buscuits and melted butter) to avoid having to make pastry.
I tried some home made ice cream as my other half was given 2litres of fresh cream by a restaurant owner he knows but that didn't work out & left me stuck with just the whites & couldn't think of anything inspiring to do with them.
I went with meringue shapey things which are now frozen & will be made into pud of some description on Sunday