Here's an art project to do with older children that I found on a website, gardeninginla.net. Let me know if you try it!
Decorate candles with flowers and foliage that you've grown and pressed yourself. Place small flowers, leaves, and vines between paper towels, and weigh down with a heavy book overnight. Pieces should be limp but not moist or crispy. Use a glue stick to tack them into place on candles. Mix and match colors, or use white candles to highlight the colors of the flowers and leaves. In an empty coffee can tall enough to hold the candle, melt six cakes of paraffin by setting it in a pan of boiling water. Dip the candle, with its tacked-on flowers and leaves, into the liquid paraffin, and hold it or set it upright until it's cool. Dip again if a thicker coating is desired.