Long story short: Ryan Zimmerman got married in January, and went to South Africa on his honeymoon. Nats fan and Photoshop aficionado Allan Petersen (@ambp77) created a series of Ryan Zimmerman-on-African-Safari-Honeymoon-themed photoshops. Ross Detwiler noticed, and (on Twitter) vowed to decorate Zim's locker with said photoshops when he got to spring training.
And Detwiler came through today, as seen in the photo above via @NationalDet.
Zim-on-safari photoshops below, via @ambp77: