WaveMyPic is a free service which can apply lake effect to your picture.
There are a lot of online tools which can edit/modify/add special effects to your pictures. WaveMyPic is one of the example which can add lake effect. Simply upload any pictures and wait for the output to come out.
After you add lake effect to your picture, you will be given a link which point to the output. You can then embedded the output to your social media account using the provided link. Below is an example output from WaveMyPic:
The generated output image’s size is quite large. So i would recommend you to use the direct link to the output picture from WaveMyPic, instead of store it on your hosting account. It will save you a lot of bandwidth.