I use the program Phiera. It's very good, free, easy to use, and it has like all the things you can think of. Look at my texture pack or my skins to see what it can make
I just started a new Survival map a few minutes ago. It's a good sized swamp, try this one out. You spawn right at the swamp. I haven't looked around much, but it looks pretty big. Seed # -6444095665036038638
Also, you just have to spawn a witch if you want one. Go into your creative inventory and search "spawn" and click on the Witch.
Well, your graphics card may be too bad for the new MC update. That could be one solution. I would down-grade to a different version of MineCraft or just wait for the next update.
I can help. This glitch has been happening since the new 1.4.4 update. There are a few ways you can stop this. - You can turn your particles off by going into the video settings - You can go into the texture pack you're using and delete the fire texture Or, - You can wait until the next update comes out.
Also, there is another glitch/bug in the new update. LAN doesn't work. There is not solution to this other than waiting for the next update.