You have absolute creative liberty when you are doing the walls of the bursary rooms. It is a room that is allotted for the toddlers and the toddlers are the best people to appreciate wild creativity. If you want to do the nursery walls with a personal touch and not just by putting up wall murals, the best option for you would be to go with the spray paints.
With spray paints you can do the detailed art work and the very effective of the spray paints would give you a fun and funky feeling. However, you have to keep it in mind that it is a nursery wall you are painting and not a street wall. Therefore, you have to be careful about the design you pick. It should appropriate for a nursery wall. If you are new with spray paints, make a little research regarding the matter through the internet and practice a little on a disposable surface.