I'm really baffled by the amount of sketch challenges being run right now by the blogs that I follow... I have a feeling that everyone was likely just busy for the month of January, and now things are back up and running strong!!
One of my favourite companies for paper pads (My Mind's Eye) is hosting a January sketch challenge, which is actually due this month on the 14th!
You can go over the blog post to get some inspiration in case you decide to enter this one!