It's very easy to create texture packs. If you don't know already go search it up and you'll find out. But that's not what I'm going to talk about here. What I'm going to talk about is how to create texture packs with higher resolutions than the standard one. You can use just about any painting program to make this work.

Step 1: Go into your browser and make sure it can search up stuff and go to links (even though most browsers can do that).

Step 2: Search up any texture pack you want with the resolution 32x32 or higher (because that's what we're trying to create)

Step 3: Once found, download that texture pack (don't worry, you can delete it later if you want)

Step 4: You now need to download some sort of zipping program. Here are 2 of my suggested ones:
WinRar: tinyurl.com/cnv87ry
7Zip: tinyurl.com/4frjo

Step 5: Once downloaded, you need to open up the downloaded texture pack with the 32x32 resolution or higher with WinRar or 7Zip.

Step 6: Next you need to create a folder somewhere but you need to remember where it is located.

Step 7: You need to now extract all the files from the 32x32 or higher resolution texture pack into that folder you created.

Step 8: Now just open up any of those files in a painting program like Gimp or any of those painting programs. Remember that programs like Paint.NET and Paint will not work because when you save them they will turn the transparent pixels into white or black. Download Gimp or some painting program that you can make transparent pixels with.
Gimp: tinyurl.com/f8ers

Step 9: Now just paint over that texture pack to whatever you want like a normal Minecraft texture pack.

Step 10: Once your texture pack is finished, within your folder highlight all the folders and files (basically just highlight everything within that folder except for the folder itself).

Step 11: Right click and choose the drop down option where you can create a zipped file. For WinRar it's "Add to Archive".

Step 12: Next, name the zipped folder to the name you want your texture pack to be name. Then make sure you are creating a .zip file, not a .rar file. Then click "Ok".

Step 13: Go to your start menu and type "&appdata&" without the quotes. Then click your .minecraft folder then within that your texturepacks folder.

Step 14: Put the zipped file into the texturepacks folder in your .minecraft folder.

Step 15: Now test out your texture pack in-game and if you like it upload it to Planet Minecraft or any sharing site for Minecraft and watch the downloads roll in. If you don't like it repeat steps 8-14.

Enjoy your new Texture Pack and I hope this tutorial helped you. Send me the link of your texture pack down in the comments below if you created one and I'd be happy to try out your texture pack. Enjoy!!!