I used to think that only Catholics observed Lent, but I guess other Christian denominations do as well. It's not a fun national holiday that atheists might celebrate, like Christmas or Easter, so I thought this article was interesting: http://www.huffingtonpost.com/vlad-chituc/why-this-atheist-is-obser_b_2750047.html 
It's written by an atheist who does celebrate Lent because it's something he finds "compelling and human." It's 40 days to try to do something better for yourself, and maybe, whatever that change may be, might stick permanently. Eating healthier, exercising more, cutting back on computer time, etc. What is the saying? It takes 21 days to form a habit? I don't know if that's true, but if it is then maybe Lent is a good time of year to try to do that.
Do you participate in Lent?