via libgdx-contribs-postprocessing and Alcove Games.

If you do want to add some fancy blooms and zooms and there’s a little allergy in you for coding in glsl you can work with fantastic library with ready to work effects.
I won’t explain importing – it’s already done on the project’s site and it’s super easy idiot-proof.
I recorded a short introduction to what it offers on some gifs below;
Each effect (source linked) presented on a GIF:

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Bloom:

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CameraMotion:

this effect is INCOMPLETE!

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CrtMonitor:

Depending on a constructor it can look in 3 ways:

public CrtMonitor (int fboWidth, int fboHeight, boolean barrelDistortion, boolean performBlur, RgbMode mode, int effectsSupport){…}

For ex:

CrtMonitor crtMonitor = new CrtMonitor(800, 480, false, false, RgbMode.RgbShift, 0);

RgbMode.ChromaticAberrations

RgbMode.RgbShift

RgbMode.None

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Curvature:

Not my video but presents effect well.

(combined with CrtMonitor effect)

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LensFlare:

Deprecated, use the LensFlare2.

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LensFlare2:

Pseudo lens flare implementation. This is a post-processing effect entirely, no need for light positions or anything. It includes ghost generation, halos, chromatic distortion and blur.
@author Toni Sagrista

Gif soon.

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MotionBlur:

A motion blur effect which draws the last frame with a lower opacity. The result is then stored as the next last frame to create the trail effect.
@author Toni Sagrista

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Vignette:

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Zoomer:

Implements a zooming effect: either a radial blur filter or a zoom filter is used.

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Antialiasings:

You didn’t expect me recording antialiasing example on a gif duh?

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Antialiasing:

Just an abstract class.

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Nfaa:

Implements the normal filter anti-aliasing. Very fast and useful for combining with other post-processing effects.
@author Toni Sagrista

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Fxaa:

Implements the fast approximate anti-aliasing. Very fast and useful for combining with other post-processing effects.
@author Toni Sagrista

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Although all the benefits it can do thorribly irritating problems with working on Android, troubleshooting here.

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Another thing which you may be interested is a some kind of a light effect, attached to a body, a mouse or anything.
I want to recommend you this tutorial. It’s also easy, just import the project, look into code and adjust it into your needs.
Minus – performance on Android devices.

I recorded my game in which I attached a light to the mouse.