During last time I visited my sister, I built a DIY lego table for her two little boys, that could also be any other activity table. It’s an IKEA hack, an extra-large kids’ activity table. It's super easy to put together and looks gorgeous if you ask me.
I wrote a super detailed blog post about things to do and not to do, including tips how to assemble IKEA furniture. Make sure to check it out, or watch a YouTube video.