If you are looking to build a picnic table, you will find a LOT of plans online. In fact, we have many picnic table plans on WoodworkCity.com. With most picnic table plans, there are simple versions and versions that are more intricate with folding backs or unique shapes. Essentially the range of plans is from beginner to intermediate (not quite difficult since the tolerances are rather low).
What this picnic table plan accomplishes is an easy / beginner plan with a custom look. The table uses a simple picture frame technique for the table top and benches that really dresses up the design.
You can find this full plan at the instructables site. You might have to register to be able to download the full PDF plan, but it is worthwhile. In fact, they even have a full “SketchUp” version of this plan.
Good luck building your own 2 x 4 picnic table.