Whatever you choose, think always of safety.
There will be the time a horse, especially a young one learning, will miss and drift to the ends and may stumble over whatever you have there.
Try to have something that will hurt the least and won't cause a fall if hit, something rather light and that will move on, not so solid it is not going anywhere, without give to it.
You could try a pair and see how it works in real life, before putting too many out there.
Well, I am lazy so I'm trying to find something pre-made! Although I like your idea.
DH and I can always make you a set a cavaletti. We have made a number of sets. We normally use a 4X4 for the pole but if you want to keep it reasonable I can use a landscape pole. Not sure how well they do or don't hold up compared to 4X4.
I have a set here that I am repainting for my trainer. I think I have made her 6 or 7. She lost one when a round bale fell on it.
Oh, well, clearly you're not thoroughly indoctrinated to COTH yet, because finger pointing and drawing conclusions are the cornerstones of this great online community. (Tidy Rabbit)
Ha ha, well it's close to free--99 cents each. Thanks Sonnysmom. I actually have 2 sets of cavaletti ends that I need to replace the poles on. But I also like those bricks that SA founds. I will have to make a trip to HD soon.