So I came across this app which I like very much, it's call Duomatic.
This app helps you blend two image together in a selected ratio/percentage of which image is more prominent, and which image you want more transparent. Just go to the app store, search for DUOMATIC, you should be seeing this
download it, and here's how it goes.
You'll be at this screen, everything's black because you haven't select or taken any photos.
So you tap on the camera icon on either the top or the bottom one, I'll start with the top one.
You can also tap on the filmroll icon to select from your photo album/camera roll.
Snap your desired image.
Now tap on the other icon, same thing, either take a new photo, or you may choose to select from your photo album/camera roll.
I'll snap a new one.
Here's the outcome, the big image is the blending of the two selected image, there's this bar below it, so you can adjust the meter to see the effects, which image do you want more prominent or transparent.
By adjusting to the extreme left, you see just the bottom image.
By adjusting to the extreme right, you see just the top image.
I'll adjust to about half way to the right, this is what I want.
Now there's this circle button on the lower right hand corner of the screen, that's to develop the final result, and it'll be saved to your camera roll/photo album. Tap it when you're done.
The final result will be shown, and then you can tap done.
Go to your photo album/ camera roll to see the image full size.
This is the outcome.
Here are some of the ones I did.