This is part of a fence I painted last year, there are actually two sections. I planted sunflowers behind it, and marigolds around the bottom. Here is how I did it.
I went to my local home improvement store and bought two sections of picket fence, which they refused to help me load to the top of my car. So I somehow wrestled them up to the luggage rack, got some twine from one of the registers and secured it to the top. I drove home slowly and carefully.
I got a gallon of white barn paint. Barn paint is wonderful. Heavy duty, and comparatively cheap.
When I got home I talked Robert into unloading the fences for me, and then I laid them across my husbands pick up bed and started painting them white. (Sorry about the paint on your truck, but since it is white too, no one will notice, probably) It took me two full weekends just to prime them with the barn paint. By then, the hubs had broke down and let me buy saw horses.

Here is another clever idea. The local home improvement will mix up small quantities of paint as samples for about $3. Plenty for this project with lots of leftovers for the next one. They also had, in the brush department some round foam dauber things. I bought a pack of three with several sizes. Robert had a stencil with some Egyptian stuff he got in a bookfair book, and I went to the local craft store and picked up another one with ivy. The flowers, butterflies and other things are freehand.

Once I got started on the fun part, Elisabeth and her friend decided to help, and it took 2 or 3 weekends to fully decorate all the slats and touch up missed areas.
I had to check several stores to find plain wood drawer pulls, but I got a few and painted them to look like bumblebees and ladybugs. My wonderful Hubs used a drill to make holes so wecould screw them on. We got 4 of those green metal fence stakes, Hubs got busy with the drill and put it all up for me.

Warning! This was not the cheap project I had invisioned. The fence was $19.99 per piece, so that was $40.00 right from the start. Another $13 for the barn paint, another $20 in paint samples, and another $20 in miscellaneous supplies - daubers, stencils, drawer pulls. The total - more than $100.

I haven't put up the fence this year, because we are moving and I am waiting to put it up in front of the new place.