Covering a concrete patio
Your post sounds like you are trying to solve two separate peoblems. The first is you consider the patio less than attractive and wish to beautify it. The second problem is keeping the toddler on the patio.
While you can ceratinly put brick or pavers on top of the patio, it would be a hard task. Prep is everything in that situation.
Have you considered a deck just off the surface??
As for the toddler, a wraought iron railing would look good. It too is screwed to the existing concrete.