That wouldn't work because with ambient heat on and a reactor it would probably blow apart with in seconds.
Or maybe you could make a multi-function laser! These always get front page unless there horrible. Trust me on this one, I've done one.
You could always make an element suggestion. If your stuck, look at the periodic table for some ideas. But don't choose Phosphorus, I'm working on that one!
you can always make grenades and bombs! there are a ton of different grenades possible, like the one above, life grenade,cold grenade,singularity grenade, water grenade, electric grenade, shrapnel grenade etc.