I went to Merbabu mountain in September. At that time is a dry season in Indonesia. Everything was yellow and dried. Although we have to go through a dusty and arid roads, but the scenery is beautiful and we addicted to back there. Here are some pictures that I got at that time.
And here are some pictures obtained by my friend (Haydi) in the same place in April at rainy season. Everything is green and fresh.
Another WPC is from here.