Yes you can find already those antennas main stream in catalogues like Farnell, Digikey.
Look for PCB patch antennas, PCB ceramic antennas. For 434/868/915 MHz.
If using these antennas, there isnt much art in design, just follow datasheet recommendations and propper PCB design.
But none of these on-board/flex antennas will beat a proper 1/4 wavelenght small wip. Use "guitar string" diameter wires and you will have great success.