If you want to change the picture or scene in the Minecraft, you can download a texture pack in Minecraft, follow the simple steps below
Go to PlanetMinecraft http://www.planetminecraft.com/resources/texture_packs/
Select a picture or look you want for Minecraft.
After that, look for the ‘download’ link or button.
Make sure you ‘show in folder’
When it is loaded, go to Minecraft.
Download Minecraft here:
https://www.minecraft.net/download
After you open it, go to ‘Mods and Texture Packs’.
At the bottom left hand corner, click ‘Open texture pack folder’.
Drag the texture pack from the download folder to the file you just open before this step.
Exit the texture pack folder.
Press on the texture pack name. E.g: if it is called ‘Goodcraft’, click on it.
After that, go to the start page of Minecraft.
Then play Minecraft, but not in that dull look.