I have my kids guess which plants will sprout first (our guess in order of sprouting were: eggplants, carrots and onions). Of course the actual sprout order wind up being onions, carrots and eggplants. It's fun to have them keep track of which will grow first (acting like mini-scientists). We hope to add to our vegetable garden list (red peppers and tomatoes). We already have broccoli and spinach (which seem to be growing like weeds).
Here is a photo of our plant nursery (we use old shoes boxes and line them with plastic bags and we also reuse the small mini plastic containers that seedings come in from the local garden store). Next to the shoe boxes, you can see we have a bucket for rainwater. It works out well, we usually get rain at least once a week.