Custom logo images in 12c/13c OEM Cloud Control

How to change the logo/banner (or any other) image in OEM Cloud Control

MOS note (Doc ID 1432203.1) will tell you this isn't feasible.

Adding a Custom Logo to EM Login page is possible from 13.3 EM Version:
Note 2390420.1 : Setting up a logo on Enterprise Manager Cloud Control Login Page
This is not feasible in Cloud Console 12, 13.1 & 13.2 EM Versions.

This is my workaround using mod_rewrite.
Create a directory for your custom images.

mkdir -p /myhomedir/customImages

Populate it with your custom images. 

Edit ssl.conf 

cd /<oem_install_dir>/gc_inst/user_projects/domains/GCDomain/config/fmwconfig/components/OHS/

vi ohs1/ssl.conf
vi instances/ohs1/ssl.conf


Add rewrite rules to the VirtualHost
Add/remove rewrites for the images you plan to replace.   

##

## SSL Virtual Host Context

##

<VirtualHost *:9999> #OHS_SSL_VH

    ##### Custom logo images ##########

    Alias "/CustImg" "/myhomedir/customImages"

    <Directory "/myhomedir/customImages">

        AllowOverride None

        Order allow,deny

        Allow from all

    </Directory>

    RewriteEngine on

    RewriteRule /em/images/OracleLogo.png /CustImg/OracleLogo.png [PT]

    RewriteRule /em/sdkImpl/core/uifwk/images/oracle_logo_sm.png  /CustImg/oracle_logo_sm.png [PT]

    RewriteRule /em/images/EM13cAppLogo.png /CustImg/EM13cAppLogo.png [PT]

    #####################################

Restart OEM.