Oooh on a rainy day/week you could do a science experiment making rock candy......it's actually an advanced project, but it's fun and tasty. over a low heat on the stove, you, mom, dissolve sugar into water without boiling it, until no more sugar will dissolve (this is called super saturating). This will take about 30 minutes or so.
While the sugar is dissolving or before to prepare things, wrap a piece of string around a pencil and tie a weight to the end....anything can act as a weight as long as it won't dissolve itself and it holds a piece of sting dangling from a pencil to the bottom of a clear glass cup. We used washers.
Lay the pencil across the top of the glass, and pour the sugar water into the glass filling it 1/2-3/4 full.
leave the glass alone for a couple days, but monitor it a few times per day. After a day or so you will see crystals forming on the string. After a few more days the crystals will become larger and larger until the entire length of string that is submerged will be covered with rock candy.
Oooh or plant a garden
letting the kids pick which plants to grow. Kids are more proned to eat the veggies they grow over veggies from a can, so this can be doubly learning for them. They will not only learn how food comes to be, but how much better something tastes when we grow it ourselves, even if it's just the pride in growing it yourself that tastes good. You can use the parable of the wheat while growing to teach how things need the right conditions to grow, just like God provides us with everything we need to grow.
for a craft idea, you could make stained glass pictures from coffee filters.
Take a coffee filter and spread it out on a table covered with newspaper or plastic. using an eye dropper put drops of food coloring or food coloring mixed with water for more pastel colors, onto the paper filter. The filter is absorbent so the drops will spread making a cool tie-dyed look on the filter.
After you make the tie-dyed or stained glass coffee filters, you can let your imagination go wild. We took pipe cleaners and made border shapes, then cut the filters out in the desired shapes and glued the pipe cleaners around the edge of the filter shapes, then hung them from the ceiling and near windows to catch the light. We had dragon flies, butterflies, snowflakes and all sorts of great creations hanging from our living room ceiling before the day was over.