I'm sorry for what you've had to deal with the past couple of years. I can sympathize, as we lost our home to a fire a few years ago. We lived in my grandfather's RV for six months and I remember how displaced I felt.
A couple of suggestions. First of all, consider donating items that were donated to your family that your family is no longer in need of. Passing on a benevolent act is nothing to feel guilty about or ashamed of. Perhaps a family is in a similar position right now that you were in when you lost your home. Culling items that are no long of use to you (a good rule of thumb is if you haven't used an item in six months and really can't foresee yourself using it within the next six months, it's time to part with it, save for sentimental objects) can be very liberating and make your living space seem less overwhelming.
Right now you're using boxes to store items on shelves such as toys, games, etc. Perhaps you could cover them with some denim fabric to look similar to these
. Fabric bins never go out of style and they can fashionably store and conceal objects.
Do you have any furniture that can be stripped and refinished at a reasonable cost? Drawer pulls can be insanely expensive, but if they are metal you can cover them in polymer clay in any design you want (I saw a cute child's dresser online with fishy knobs) and bake them according to the directions. Check stores like Lowe's and Home Depot for "Ooops" paint, the paint that was mixed incorrectly or a customer brought in the wrong color sample. I painted an entire bathroom in oops paint once. Paint that was originally way out of my budget ended up costing me substantially less by purchasing from the "ooops" pallet.
I think one of the most difficult aspects of losing a home under any sort of disastrous circumstances (flood, fire, tornado/hurricane, etc.) is that while you're grateful for your lives, it's hard to come to grips with the magnitude of losing your possessions. Most of the things that were lost could be replaced, but some things could not. It's difficult to not hoard things after you've lost personal belongings. It took me a couple of years to where I was willing to part with a lot of my clutter.
Even if you make a small, redecorated space (such as making storage bins or reupholstering a chair or making a braided rug) you will feel a sense of accomplishment and pride and that tends to affect the whole family positively. Keep your chin up. Things get better and they tend to get better when you least expect it.