Any ideas for projects with my dried-up flowers?

Sure you can put them in a book til they are good and flat, buy three 8 X10 picture frames and color contact paper for back ground to bring out the color in flowers I think maybe yellow or a light green or white you can use your choice of color, or maybe use in a dish as potpourri with a few drops of scented oil

Back in the 1800's they used to make pretty flower arrangements using dried flowers and they mounted them (glued them) inside a picture frame then covered the frame with bubble glass (curved glass). I would choose a nice color that coordinates with the colors in your flowers to use behind them or just spay paint the frame backing to match. This not only made a beautiful picture to hang on your wall it also kept your dried flowers clean and dry so no need to dust them forever. You can still pick-up those pretty antique bubble glass picture frames at auctions or possibly flea markets now and then but you might check out Hobby Lobby. They do make reproductions of them and Hobby Lobby just might have them. Hope this helps!

How about spray painting them silver or gold for an arrangement. The ones in the high -end store are very expensive.

You can dry them in the microwave. I've done it. Works great. Here's how

https://www.youtube.com/watch?v=IIb879Uhda8

I used to dry golden rods for floral arrangements.Spray painted them high end colors.

I cut my hydrangeas and let them either hang upside down or in a vase to dry and them I stick the stems into a grape vice wreath. So far it is holding up well. I'm about half way around now. I put all colors together, blue, pink, pink/green combo. I love it.

I do flower arrangements with dried flowers mixed with origami flowers in baskets.