Hi Alexa, I have soo many ideas but only one playroom! If you would like to see pictures of it just send me your email, I have a home daycare so I set it up to be for boys and girls. You should start by choosing a neutral color or a color you will not mind seeing every day for the walls, after choosing the colors, make a list of the main toys/furniture you would like to place there for instance a toy kitchen, small sofa or individual rocking chairs, bookcase and shelves for toys or bins, a table for art or an easel. After you know what things you will place in the room, draw a plan of the room and where you would like to place each thing. Once you have an idea of where everything would go, it's time for the measurements I went online and wrote the measurements of each thing (play kitchen, easel, table, sofas, etc.) that I wanted to place in the room, this helped me choose things that where not too big for the space I had for each thing. Your drawing/plan will probably change as you come up with ideas and check measurements but make sure everything you buy will fit in and not be too big or small for its purpose. With the measurements ready, get some painters tape if you have hard floors or place strips of paper if you have carpet and measure and place the tape/paper on the area where each thing will go, this will help you visualize exactly the space things will take and how much space you will have left after you put everything in and that way you will know if you need to make any changes to your plan/drawing. You don't want it to be too crowded, also choose toys that spark their imagination and can be use in different ways, like a store stand with a cash register can be use as grocery store or a shoe store, if you place a kitchen with a small table they can be a chef/waiter/customer or just a mom cooking! Place another bigger table for doing art and crafts there are some really cute ones that have storage underneath for papers, books, colors,etc. For the walls you can place hooks in one area to hang the smocks/aprons and dress up clothes, and decorate with borders you can also use posters or words or use some chalk paint or magnetic paint, you can paint an entire wall with it or make some squares with the paint.
About the floor I originally had carpet but since they were going to use paint, glue, playdough, and other fun & messy things, I changed it to harwood laminate in a color that was not too dark or light, it's very easy to clean you can wipe any mess right up and I don't have to worry about stains in the carpet. For the areas like the reading, kitchen, and block building I bought small carpets that are washable and not too big, this helps separate the different areas and reduce the noise the toys make when they hit the floor. Well some of these ideas should help you if not email me, I have lot more ideas! Have fun decorating :-)