Well, you may have just picked up on of the Wiltons painted rocks and don't worry they haven't lost them, they want you to find them - and even keep them.

Rock painting hide and seek has been happening around NSW for a few years and has picked some momentum in Tamworth of late.

Lisa Wilton and her family have been rock painting for 18-odd months now.

They first got involved in Muswellbrook before they moved to Tamworth about 10 months ago.

"We found out through a few friends in Muswellbrook...the kids were lucky enough to find one and we painted a few and they were hooked," Lisa said.

"It's basically just the enjoyment of brightening someone's day, cheering someone up and the kids love it.

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She added: "We even just use it as a family activity. It gets you outdoors and gets the kids off their computers and phones as well."

It's a pretty simply concept. All you need to do is paint a rock, leave it somewhere and then hopefully someone finds it. They can then keep it, or re-hide it.

People are also encouraged to post a photo on the NSW ROCKS Facebook group - which boasts over 50,000 members.

"They [the kids] love seeing the rocks [on Facebook], particularly their own designs," Lisa said.

The other aspect of this game of hide and seek that enthrals the kids is how far a rock can travel.

"We know one of ours has headed over to Cairns, it was a local Tamworth drop," Lisa said.

"We've even heard of some going overseas."

Anyone can get involved by painting their own rocks or going out for a look around.

The NSW ROCKS Facebook page is good starting place.