I came across a mikroBUS shield for Arduino Mega on eBay. It seemed worthy of an investigation.
Each mikroBUS™ socket consists of two 1×8 female headers containing pins that are most likely to be used in the target accessory board. There are three groups of communication pins: SPI, UART and I2C communication. There are also single pins for PWM, Interrupt, Analog input, Reset and Chip Select. Pinout contains two power groups: +5V and GND on one header and +3.3V and GND on the other 1×8 header. mikroBUS™ socket perfecty fits into standard breadboards.
mikroBUS Arduino Mega shield