All you need is fresh mozzarella, grape (or cherry) tomatoes, and fresh basil leaves for the skewers.
If your basil leaves are large enough, you can skewers them on either side of your tomato and mozzarella cube. If not, make due the best you can. If you've grown your own basil, it's easy to pick the right size, but when shopping at the market, you need to just go with the flow. No biggie. Make it the best you can.
When you're done, just lightly drizzle the skewers with olive oil and then balsamic vinegar. Instant hit and easy to eat.