To start, you need to make a new file at roughly 100x100px and 150 resolution and make a new layer over the background. Make sure the Background is white. (The bigger the file, the bigger the brush)
Since we are using the pen tool, Here is a link to a pen tool tutorial. It's very helpful and you will find the pen tool is easier to use then the nightmare people make it out to be.
You will need to choose what you want to make a brush out of. I chose to make a shape resembling a group of flower buds.
When You have the shape you want to make finished, right (cmd) click to show the drop down menu. Click on Fill Path and set the color to black or it will not work.
When you have the path filled, right (cmd) click again and select Delete Path. When You're done, copy the layer (cmd or ctrl+J) and Free Transform the layer until you have it the way you like it. Repeat as many times as you want, or you can continue to make more shapes. Be sure to merge all layers except the background layer. (Hint: the more anchors you use, the more control over the shape you have.)
Now that you have the shape you want, go to File+ Define Brush (Pattern) and you will get the following box. Name the Brush what ever you like and click Ok.
To find the Brush, click on the Brush Tool and go to the drop down menu. At the bottom of the list, there will be your new brush.
2. How to Make a Brush From a Photo 1
First, you will need to go find a picture with a solid white background. Copy the image and paste it onto the same file as the first brush. Turn the layer of the first brush off.
When you're done with that, you should erase whatever watermarks you can, and wither set the picture to black and white or leave as is. Then, go to File+ Define Brush (Pattern) and name the brush whatever you like.
When you press Ok, your new brush will be in your brush menu box right underneath the first brush you made.
3. How to Create a Brush From a Photo 2
First You need to choose a picture to use for your brush. But this time, it wont matter if you do not have one with a solid background. You will need to select the Pen Tool again and create a new layer.
With the Pen Tool, go around everything you want to be part of the Brush.
After you have your path, De-select the path by clicking on the picture while holding down the cmd or ctrl key. Then Right (cmd) click for the drop down menu and select the Stoke Path, or you can fill the path. I used a 3px at 0% hardness for this picture. Be sure that the Simulate Pressure Box is un-checked.
When ready, delete the path so you have an outline like this.
Next, you will need to turn the flower layer off so it's not visible and go to File+ Define Brush (Pattern). You will find this beneath your first two brushes in the Brush drop down selection menu.
Now you know how to create your own brushes in Photoshop. I hope you found this useful. Cheers!
to do, and found that it's very powerful and bright. So, I had the idea that I could take pictures of random objects through the magnifying glass. Sort of like macro shooting without the macro lens. 
You really can't tell I was using it to take the pictures, but I did take some pictures to demonstrate it's power. As I was saying, I tried taking pictures of different objects, but the lights on the thing were weird and I just couldn't find the correct color balance.
So I just gave up and used the cloudy setting. As I was taking the pictures I tried to show some of the distortion of the magnifying glass.
It really only worked a couple of times, But I did notice that some of th objects looked like something that they weren't Like the picture of the wings.